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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7751477377436aaed7838b165f1c45905f89f068ceb4540739246aad2af4f3cb' 
  AND token = 'VoHuTG4KPNFOas6MnQSR+yGsdftKAHQrM1o2X80LI2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}